Portable electric rivet-heater



L. T. WEIDRICK. PORTABLE ELECTRIC RIVET HEATER.

APPLICATION FILED APR. 6,1920- Patented Aug. 10, 1920.

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L. T. WEIDRICK.

PORTABLE ELECTRIC R'IVET HEATER.

APPLICATION FILED APR. 6v 1920.

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PATENT OFFICE.

LOUIE T. WEIDRICK, OF BALTIMORE, MARYLAND.

PORTABLE ELECTRIC RIVET-HEATER.

Specification of Letters Patent.

Patented Aug. 10, 1920.

Application filled April 6, 1920. Serial No. 371,566.

To all whom it may concern:

Be it known that I, LOUIE T. IVEIDRICK, a citizen of the United States of America, residing in the city of Baltimore, State of Maryland, have invented certain new and useful Improvements in Portable Electric Rivet-Heaters, of which the following is a specification.

In structural steel work, ship-building and the like, hot rivets are ordinarily supplied to the workmen, by means of a charcoal or coal furnace, or forge, located at some more or less distant point, from which point the hot rivets are thrown to the workman who is setting the rivets and caught in a convenient receptacle. Such forges or furnaces, while they may be carried from place to place and are shifted as construction progresses, are not portable in the full sense of the word, in that they are only They must have a fairly substantial support of sufiicient area and there must be a supply of uel.

The present invention relates to a rivetheating furnace or forge, which is portable in every sense of the word, in that it may be carried to any part of the structure and placed on almost any kind of a support, or it may be conveniently suspended, and, as it is electrically heated, no fuel supply is necessary andv there is nothing to be spilled. Also, the furnace is so constructed that the rivets cannot be brought in contact with the terminals, so that there is no danger of accidental shock when the rivets are being withdrawn or at any time.

In the accompanying drawings I have illustrated a portable, electric, rivet-heating furnace or forge, constructed in accordance with my invention.

In the drawings:

Figure 1 is a top plan.

Fig. 2 is an elevation of the furnace.

Fig. 3 is a section on the line 3-3 of Fi 1.

. ig. 4 is a section on the line 4-4 of Fig. 2.

Fig. 5 is a section taken on the line 5-5 of Fi 2.

Re erring to drawings by numerals, the

portable electric furnace or forge consists of a casing or box, 1, of sheet metal or other suitable material, inclosing a heating chamber, 2, lined with firebrick, 30, or other heat-resisting,non-conducting material. The

, ustment.

heating chamber, 2, contains the arcing terminals, 3, which are in the form of carbon pencils or other suitable resistive conducting material. These pencils as shown, hav ing particular reference to Fig. 4, are mount ed in suitable guides, 5, in the end walls of the furnace, so that they may he slid in the direction of their length, to and from each other, the guides being in alinement.

In the structure shown each of the carbons is bored lon itudinally from the rear end at 6, and this longitudinal bore receives a screw 7, having a swivel connection to an insulating plate, 8, through which it extends, the plate being in turn secured to a cap or casing, 9, on the outer wall of the furnace. One of these casings is provided to inclose the rear end of each carbon pencil, 5. Each of these pencils is also slotted near the rear end, the slot extending in the direction of its length, and there is a movable key, 10, carried by an arm, 10', of a bell crank lever, 11, pivotally mounted within the casing. Each key engages the slot, 12, in the corresponding carbon pencil and prevents it from rotating, while permittin it to slide in the direction of its length. ach of these pivoted keys is held in place, i. e., is pressed into the slot, by means of a spring. 13, encircling a slotted stud, 14, projectin from a suitable metal base-plate, 15, whic also carries the pivot, 18, the latter being mounted in suitable ears, 16, it being understood that the tail of the bell crank, 10,-

extends through the slot in the stud, 14, and is pressed by the spring, 13, which is adjusted and held in position by a thumb nut, '17, the tension imparted to the bell crank by the spring being such as to cause the key portion thereof, 10, toengage the slot, 12. Each plate, 15, also carries a terminal or binding post, 20, the current bein carried to and from the carbons througfi the binding post to the plate, 15, thence through the ears, 16, to the kc and to the carbon, it being, of course, un erstood that the stud, 14, may also act as a conductor. The case is provided with an aperture in line with the stud, 14, and nut, 17, the same being covered by a removable plate, 34, to rovide access to the nut for purposes of ad- The box, 1, is divided into two compartments, one inclosing the heating chamber,

2 with the lining, 30, of heat-resistive material, the other compartment, 31, being, in

fact, a switch box containing the double knife blade switch, 32, with the terminals, 33 and 34..

Figs. 1, 2 and 3 show a door, 24, with a catch, 25, providing access to the switches. These figures also show handles, 26, by which the furnace may be carried or suspended.

The drawings also show wiring, 27, leading to the outside circuit from which the current is obtained, and a lamp, 29, having its socket in the outside wall of the furnace and included in the circuit for indicating purposes.

An important feature of the furnace is found in the form of the heating chamber, 2, the position of the arcing terminals, 3, and the arrangement of the furnace door or opening, 35, whereby contact of the rivets, or the riveters pliers by means of which the rivets are handled, with the arc is made impossible so that the possibility of accidental shockto the operator is eliminated. This arrangement consists in constructing heating chamber, 2, with the entrance or opening, 35,'as shown, of L-shaped cross section, with the arcing terminals, 3, well up in the upright portion of the L, so that theyare not accessible for contact by the pliers or the rivets thrust in at the opening, 35, and to this end'the opening or horizontal passage, 35, is made of considerable lengthfrom the chamber, 2, to the outside air, and in the present instance I have provided a projecting flange, 33, surrounding the mouth of the opening, increasing the length .of the passage, 35 and contributing to increase the desired effect as pointed. out. While this flange, 33, is referred to as surrounding the opening, it is shown only at the top and bottom.

I have 'ust described a portable, electric, rivet-heatlng furnace or forge, embodying the features ofmy invention in the preferred'form, specifically and in detail, in order that the nature and operation of the same may be clearly understood; however, the specific terms herein are used descriptively rather than in a limiting sense, the scope of the invention being defined in the claims.

What I claim and desire to secure by this patent is:

1. In a portable, rivet-heating furnace, having a heating chamber of L-shaped cross section, the bottom arm of the L forming a passage for inserting and removing the rivets, an electric heating means in the upright of the L, well above and out of alinement with said passage. 1 V

2. In a portable, electric furnace for heating rivets, having a heating chamber lined LOUIE WEIDRICK.

Witnesses:

' PORTER H. FLAUTT,

ZELLA KUHN. 

